中文摘要：

提出一种基于子图像邻域梯度信息度量的边界提取算法,通过构造邻域信息映射矩阵并利用矩阵梯度信息度量值提取图像目标的有效边界,详细阐述了应用本文算法实现劣质液滴图像的边界检测及接触角测量的方法与步骤。实验结果表明：本文算法能有效地提取劣质液滴图像的目标边界,完成液滴接触角的自动计算,接触角计算结果与人工计算结果基本一致。

英文摘要：

The paper proposed a boundary extraction algorithm based on sub-image neighborhood gradient information metrics. By constructing the neighborhood information mapping matrix and using the metric of matrix gradient information, the proposed algorithm extracted the effective border. The methods and procedures were analyzed for boundary detection and contact angle measurements of the image of poor droplet. Experimental results show that this algorithm can effectively extract the object boundaries of the image of poor droplet and achieve the automatic calculation of contact angle, whose results are consistent with the manual calculations.